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Unread 07-19-2013, 10:13 AM   #1
elemon5601
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1995 ZJ 
 
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High Idleing

alright i have a 95 zj laredo v8 4x4 all time that has been idling at 500 rpm in drive and 700 rpm typically in park. i cleaned my IAC sensor a couple of days ago, and it idled a little better. but yesterday i put in some gumout fuel cleaner and it began to idle at about 1000 rpm in drive and 1500 rpm in park. i feel like thats really high, any ideas whats wrong?

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Unread 07-19-2013, 10:36 AM   #2
zj97ltd
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If, when you cleaned your IAC, you twisted or pushed on the little plunger, you may have ruined it. Or you may just have a loose vacuum line.
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Unread 07-19-2013, 10:41 AM   #3
elemon5601
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which vacuum line would be loose?
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Unread 07-19-2013, 10:48 AM   #4
zj97ltd
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If you took the TB off to clean the IAC then pretty much any one that connects to it. There's also a big one that goes from the PCV valve to the passenger side of the intake, a lot of oil fumes go through that and over time, it pretty much disintegrates. You'll more or less have to check all the connections one by one, no easy way that I'm aware of.
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Unread 07-19-2013, 10:49 AM   #5
zjosh93
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Quote:
Originally Posted by zj97ltd View Post
If, when you cleaned your IAC, you twisted or pushed on the little plunger, you may have ruined it. Or you may just have a loose vacuum line.
Every time I clean my IAC I push the plunger back in a bit. When I reinstall it my idle speed will jump to 1500 - 2500 rpm but after ten seconds or so it will start to drop in roughly 200 rpm increments as the computer adjusts. Take a minute to get back to normal but I know my IAC works.

Last time I unscrewed it all the way and gave the innards a good squirt of white lithium grease.
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Unread 07-19-2013, 10:49 AM   #6
zj97ltd
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Also, if you took the TB off, could very well be the gasket between it and the manifold if you didn't replace it.
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Unread 07-19-2013, 11:14 AM   #7
elemon5601
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haha sorry im pretty new to jeep but what does TB stand for?
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Unread 07-19-2013, 11:18 AM   #8
kodenz
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Throttle body

Sent from somewhere
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5.2L 1997 ZJ limited Up-Country+2in BB
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Unread 07-19-2013, 11:26 AM   #9
zj97ltd
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Quote:
Originally Posted by zjosh93 View Post

Every time I clean my IAC I push the plunger back in a bit. When I reinstall it my idle speed will jump to 1500 - 2500 rpm but after ten seconds or so it will start to drop in roughly 200 rpm increments as the computer adjusts. Take a minute to get back to normal but I know my IAC works.

Last time I unscrewed it all the way and gave the innards a good squirt of white lithium grease.
Oh ok didn't know you could do that. I remember reading somewhere on here that messing with the plunger was a big no no.
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Unread 07-19-2013, 11:31 AM   #10
zjosh93
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Maybe true for some IACs. I've had three in my ZJ and none of them seemed to mind. IMS the Haynes manual tells you to push the plunger in as part of testing the IAC but I could be mistaken. Both the IACs I bought said to push the plunger back to make sure it didn't jam on the housing when you install it.
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Unread 07-19-2013, 11:44 AM   #11
elemon5601
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just checked the vacuum lines, one had a crack that i tapped up, but everything else seemed fine on the TB
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Unread 07-19-2013, 12:23 PM   #12
elemon5601
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Its still idleing at like 1200 rpm and will move up to 1500 rpm and keeps moving up and down but will idle at about 700 rpm in drive
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